diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/Array-mapPar-short.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/Array-mapPar-short.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+load(libdir + "parallelarray-helpers.js");
+
+function test() {
+  // Test what happens if the length of the array is very short (i.e.,
+  // less than the number of cores).  There used to be a bug in this
+  // case that led to crashes or other undefined behavior.
+  var makeadd1 = function (v) { return [v]; }
+  assertArraySeqParResultsEq(range(1, 3), "map", makeadd1);
+}
+
+if (getBuildConfiguration().parallelJS)
+  test();